Symptom-based Troubleshooting SiBE34-802126 Troubleshooting6 COOL-HEATselection isdisabled.The remote controller displays"UNDER CENTRALIZEDCONTROL".This remote controller has nooption to select cooling operation. Use a remote controller withoption to select cooling operation.The remote controller displays"UNDER CENTRALIZEDCONTROL", and the COOL-HEAT selection remotecontroller is provided.COOL-HEAT selection is madeusing the COOL-HEAT selectionremote controller.Use the COOL-HEAT selectionremote controller to select cool orheat.7 The systemconducts fanoperation but notcooling orheatingoperation.This symptom occursimmediately after turning ONthe power supply.The system is in preparationmode of operation. Wait for a period of approximately10 minutes.8 The airflow rateis notreproducedaccording to thesetting.Even pressing the AIRFLOWRATE SET button makes nochanges in the airflow rate.In heating operation, when theroom temperature reaches the setdegree, the outdoor unit will stopwhile the indoor unit is brought tofan LL operation so that no onegets cold air.Furthermore, if fan operationmode is selected when otherindoor unit is in heating operation,the system will be brought to fanLL operation.(The fan LL operation is alsoenabled while in oil return mode incooling operation.)Normal operation.9 The airflowdirection is notreproducedaccording to thesetting.The airflow direction is notcorresponding to thatdisplayed on the remotecontroller.The flap does not swing.Automatic control Normal operation.10 A white mistcomes out fromthe system.In cooling operation, theambient humidity is high.(This indoor unit is installed ina place with much oil or dust.)Uneven temperature distributiondue to heavy stain of the inside ofthe indoor unitClean the inside of the indoor unit.Immediately after coolingoperation stopping, theambient temperature andhumidity are low.Hot gas (refrigerant) flown in theindoor unit results to be vaporfrom the unit.Normal operation.After the completion ofdefrosting operation, thesystem is switched to heatingoperation.Defrosted moisture turns to bevapor and comes out from theunits.Normal operation.Symptom Supposed Cause Countermeasure
